Client biome components go in the components object of a client biome file in the resource pack: they set how a biome looks and sounds, like its sky, fog, water and music. This list has all 14 of them in Minecraft 1.26.50.4.
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Component
minecraft:ambient_soundsSets the background sounds players hear in the biome.minecraft:atmosphere_identifierPicks the sky and air look used in Vibrant Visuals for this biome.minecraft:biome_musicChanges the music that plays while the player is in this biome.minecraft:color_grading_identifierPicks the color grading (the overall color mood of the screen) used in Vibrant Visuals for this biome.minecraft:cubemap_identifierPicks the skybox picture used in Vibrant Visuals for this biome.minecraft:dry_foliage_colorSets the color of dry plants, like leaf litter, in this biome.minecraft:fog_appearancePicks the fog settings used in this biome, so you can make it hazy, clear or tinted.minecraft:foliage_appearanceSets the color of leaves and vines in this biome.minecraft:grass_appearanceSets the color of grass in this biome.minecraft:lighting_identifierPicks the lighting setup (sun, moon and light colors) used in Vibrant Visuals for this biome.minecraft:precipitationAdds floating particles that drift through the air, like the ash and spores in Nether biomes.minecraft:sky_colorSets the color of the sky in this biome.minecraft:water_appearanceSets how the top of the water looks in this biome, like the green water of swamps.minecraft:water_identifierPicks the water look used in Vibrant Visuals for this biome.